CAJ | 학술논문

采用循环伏安法和原位傅里叶变换红外(FTIR)光谱法研究了碱性介质中间溴苯甲酸(3-BBA)在Pt电极上的电化学氧化反应.3-BBA在Pt电极上有良好的电化学活性.在较低的氧化电位作用下(1000 mV),3-BBA自由基负离子先在Pt电极上失去一个电子,生成对应的自由基,继而发生脱羧反应生成溴苯自由基阳离子和二氧化碳.随着电位的正移,吸附在电极表面的羟基自由基进攻溴苯阳离子,发生脱溴反应,生成苯酚.随着电位的升高,苯酚继续氧化生成苯二酚以及苯醌等,部分苯环还可经开环得到马来酸和富马酸.
채용순배복안법화원위부리협변환홍외(FTIR)광보법연구료감성개질중간추분갑산(3-BBA)재Pt전겁상적전화학양화반응.3-BBA재Pt전겁상유량호적전화학활성.재교저적양화전위작용하(1000 mV),3-BBA자유기부리자선재Pt전겁상실거일개전자,생성대응적자유기,계이발생탈최반응생성추분자유기양리자화이양화탄.수착전위적정이,흡부재전겁표면적간기자유기진공추분양리자,발생탈추반응,생성분분.수착전위적승고,분분계속양화생성분이분이급분곤등,부분분배환가경개배득도마래산화부마산.
Electrochemical oxidation of 3-bromobenzoic acid (3-BBA) on a Pt electrode in alkali solution was studied by cyclic voltammetry and in situ Fourier transform infrared (FTIR) spectroscopy. The Pt electrode exhibited good performance for the electrooxidation of 3-BBA. At low oxidation potential (1000 mV), one electron was removed from the 3-BBA radical anion and the corresponding free radical was generated. A Bbromobenzene free radical cation and carbon dioxide were obtained after decarboxylation. The bromobenzene cation was then attacked by the hydroxyl radical, which was adsorbed on the anode, and the bromobenzene cation intermediate product was debrominated to form phenol. When the potential shifted to more positive values, phenol was electrooxided to produce dihydroxybenzene and benzoquinone. Maleic acid and fumaric acid were also detected as the reaction products of the ring-opening reaction.